Study on deformation and strength characteristics and damage constitutive model of semi-diagenetic rocks
DU Yuxiang1，2，SHENG Qian1，2，FU Xiaodong1，2，DAN Luzhao3，4，ZHANG Zhenping1，2，DU Wenjie1，2，CHEN He4，5
(1. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China；2. University of Chinese Academy of Sciences，Beijing 100049，China；
3. Yunnan Dayong Highway Construction Company Limited，Dali，Yunnan 671000，China；4. Yunnan Communications Investment and Construction Group Co.，Ltd，Kunming，Yunnan 650200，China；5. Broadvision Engineering Consultants，National Engineering Laboratory for Surface Transportation Weather Impact Prevention，Kunming，Yunnan 650041，China)
Abstract：The engineering properties of semi-diagenetic rock are poor，especially for the mechanical properties which are greatly affected by the water content. Taking the semi-diagenetic rock of the Xigeda formation as the research object，the deformation characteristics and failure mechanisms of semi-diagenetic rocks are studied by triaxial tests in laboratory，and a damage constitutive model reflecting the total stress-strain process of semi-diagenetic rocks is established by introducing the damage theory. The results show that，with increasing the confining pressure，the peak and residual strengths of semi-diagenetic rocks increase，and the axial strain corresponding to the peak strength and the fluctuation of the stress-strain curve in the softened stage increase. With increasing the water content(from 17.79% to 30.83%)，however，the peak strength of semi-diagenetic rocks decreases rapidly，the residual strength decreases in a less range，and the axial strain corresponding to the peak strength increases. When the water content is low，the peak point is sharp and the post-peak stress falls rapidly to the residual strength，which shows softening characteristics. When the water content is high，the peak point collapses and the slope of the stress curve after the peak is slower，showing a trend from strain softening to strain hardening similar to soils. The peak and residual strengths obey Mohr-Coulomb criteria in the range of experimental water content，and all strength indexes decrease approximately linearly with increasing the water content with a more sensitivity of the peak cohesion and the peak friction angle to the water content than that of the residual cohesion and the residual friction angle. It is also indicated that the developed model with a simple form and less parameters can well describe the strength and deformation variations of semi-diagenetic rocks affected by the water content and the model curve is consistent with the experimental results. The research results can provide experimental basis and mechanism understanding for the analysis of mechanical properties and engineering application of semi-diagenetic rocks.
杜宇翔1，2，盛 谦1，2，付晓东1，2，但路昭3，4，张振平1，2，杜文杰1，2，陈 贺4，5. 半成岩变形强度特征与损伤本构模型研究[J]. 岩石力学与工程学报, 2020, 39(2): 239-250.
DU Yuxiang1，2，SHENG Qian1，2，FU Xiaodong1，2，DAN Luzhao3，4，ZHANG Zhenping1，2，DU Wenjie1，2，CHEN He4，5. Study on deformation and strength characteristics and damage constitutive model of semi-diagenetic rocks. , 2020, 39(2): 239-250.
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2020, Vol. 39 
